'Stranger lines' presentation slideshows

Remember the Isosceles Triangle Theorem?

Remember the Isosceles Triangle Theorem?. A. B. C. Do you remember how to prove it?. A. Construct an angle bisector and then prove the two resulting triangles congruent by SAS. ?. B. C. D. P. Sometime during class tonight we will prove the following theorem: Crossbar Theorem :

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